# ActsAsSummarizableJapanese

#Copyright(c) 2007 殊海夕音( http://ame.yumenosora.net/ )
#
#  Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
#  
#  1   Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
#  2   Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
#  3   The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
#  
#  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#

require 'active_record'
require 'vendor/summary_maker2'

module Yumenosora
  module Acts
    module SummarizableJapanese
      def self.included(mod)
        mod.extend(ClassMethods)
      end
      
      module ClassMethods
        def acts_as_summarizable_japanese(options = {})
          return if self.included_modules.include?(
            Yumenosora::Acts::SummarizableJapanese::InstanceMethods
          )
          
          cattr_accessor :summarizable_field
          
          #要約エンジンの初期化
          Yumenosora::Summarize::initialize(
            options[:words_db], 
            options[:words_count]
          )
          
          #要約対象のカラム名
          self.summarizable_field = options[:summarizable_field] || :body
          
          include Yumenosora::Acts::SummarizableJapanese::InstanceMethods
        end
      end

      module InstanceMethods
        #optionsは以下の通り
        #:summay_size => 要約文のサイズ。1以下を指定すれば比率、1以上なら文の数
        #:keywords => 抽出するキーワードの数
        
        #要約のみを取得する
        def summary_of(options = {})
          ret, dummy = summary_and_keywords_of(options)
          
          return ret
        end
        
        #キーワードのみを取得する
        def keywords_of(options = {})
          dummy, ret = summary_and_keywords_of(options)
          
          return ret
        end
        
        #要約とキーワードを同時に取得する
        def summary_and_keywords_of(options = {})
          return Yumenosora::Summarize::process(
            self[summarizable_field], options)
        end
      end
    end
  end
end

# reopen ActiveRecord and include all the above to make
# them available to all our models if they want it

ActiveRecord::Base.class_eval do
  include Yumenosora::Acts::SummarizableJapanese
end
